>> Not sure if it's still the case, but these drives used to have smaller >> platters to reduce the seek time, so they were pretty much 2.5" drives >> in a 3.5" shell. > > Impossible.
Well a quick Google suggests otherwise: http://www.pcguide.com/ref/hdd/op/mediaSize-c.html (see table at end of page) And to quote from the end of http://www.datarecoverylink.com/understanding_platter_sizes.html: "Decreasing the size of the platters decreases the distance in which the head actuator must move the heads side-to-side performing random seeks thus improving seek time and making random reads/writes more efficient...The movement to smaller platters began in earnest when some manufacturers "trimmed" the platters in their 10,000 RPM hard disk drives from 3.74" down to 3" while keeping them as standard 3.5" form factor drives on the outside for compatibility. Seagate's Cheetah X15 15,000 RPM drive goes even further, dropping the platter size down to 2.5", again trading performance for capacity" >> So given equal RPM the 2.5" drive should have a faster full-stroke seek, >> but as has been pointed out, an SSD would be even better in this respect. > > How do you see an effort of 2.5" against 3.5"? Well if the platters are smaller the heads have less distance to move, so seeking from the start of the disk to the end would be quicker... > The opposite is fact. > >> [1] >> http://www.latestpcnews.com/western-digital-launches-new-backplane-compatible-wdvelociraptor-hard-drive/ > > Only advertising, sorry. Not all advertising is wrong :-) Cheers, Adam. _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
